Toyota Jidosha Kabushiki Kaisha

Fine Sinter Co., Ltd

Sanyo Special Steel Co., Ltd.

Yoshihisa Ueda

Nobuyuki Shinohara

Yusaku Yoshida

Masaru Sugimoto

Toshiyuki Sawada

Kimihiko Ando

Shingo Fukumoto

Yuki Kamo

Kimihiko Andou

Takanori Yoneda

An iron alloy powder consists of, when the entirety thereof is assumed to be 100 mass %, Cr: 2.5 mass % to 3.5 mass %, Mo: 0.4 mass % to 0.6 mass %, and Fe and inevitable impurities as the balance, a mixed powder consisting of 15 mass % to 40 mass % of the iron alloy powder, 1.2 mass % to 1.8 mass % of a copper powder, 0.5 mass % to 1.0 mass % of a graphite powder, and a pure iron powder as the balance when the entire mixed powder is assumed to be 100 mass % is compacted into a compact, and the compact is sintered while transforming a structure derived from the pure iron powder into a structure in which a ferritic structure and a pearlitic structure are mixed and transforming a structure derived from the iron alloy powder into a martensitic structure.

Manufacturing method of wear-resistant iron-based sintered alloy and wear-resistant iron-based sintered alloy

A sintered alloy is produced from mixed powder containing first hard particles, second hard particles, graphite particles, and iron particles. The first hard particles are Fe&#x2014;Mo&#x2014;Ni&#x2014;Co&#x2014;Mn&#x2014;Si&#x2014;C-based alloy particles, the second hard particles are Fe&#x2014;Mo&#x2014;Si-based alloy particles, the mixed powder contains 5 to 50 mass % of the first hard particles, 1 to 8 mass % of the second hard particles, and 0.5 to 1.5 mass % of the graphite particles, when total mass of the first hard particles, the second hard particles, the graphite particles, and the iron particles is set as 100 mass %.

Production method of sintered alloy, sintered-alloy compact, and sintered alloy

The object of the present invention is to provide a compact for producing a sintered alloy which allows a sintered alloy obtained by sintering the compact to have improved mechanical strength and wear resistance, a wear-resistant iron-based sintered alloy, and a method for producing the same. The wear-resistant iron-based sintered alloy is produced by: forming a compact for producing a sintered alloy from a powder mixture containing a hard powder, a graphite powder, and an iron-based powder by powder compacting; and sintering the compact for producing a sintered alloy while diffusing C in the graphite powder of the compact for producing a sintered alloy in hard particles that constitute the hard powder. The hard particles contain 10% to 50% by mass of Mo, 3% to 20% by mass of Cr, and 2% to 15% by mass of Mn, with the balance made up of incidental impurities and Fe, and the hard powder and the graphite powder contained in the powder mixture account for 5% to 60% by mass and 0.5% to 2.0% by mass of the total amount of the hard powder, the graphite powder, and the iron-based powder, respectively.

Compact for producing a sintered alloy, a wear-resistant iron-based sintered alloy, and a method for producing the same

Mixed powder that contains first hard particles, second hard particles, graphite particles, and iron particles is used to manufacture a sintered alloy. The first hard particle is a Fe&#x2014;Mo&#x2014;Cr&#x2014;Mn based alloy particle, the second hard particle is a Fe&#x2014;Mo&#x2014;Si based alloy particle. The mixed powder contains 5 to 50 mass % of the first hard particles, 1 to 8 mass % of the second hard particles, and 0.5 to 1.0 mass % of the graphite particles when total mass of the first hard particles, the second hard particles, the graphite particles, and the iron particles is set as 100 mass %.

Manufacturing method of sintered alloy, compact for sintering, and sintered alloy

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Nagaokakyo, Japan

Yoshihisa Ueda